Products of latex character and a process for producing the same



Patented June 21", 1932 UNITED STATES PATENT OFFICE,

MARTIN LUTHER, or mnmrnnm, AND ennirs annex, or LunwIGsmmI-oN-mmama GERMANY, nssrenoas are I. G. rnananmnusrma AKTIENGESELLSOHAIT, or rmxroar-on-rnn-mam, GERMANY, A CORPORATION or GERMANY PRODUCTS OF LATEX CHARACTER AND A PROCESS FOR PRODUCING THE SAME No Drawing. Applieationnleti January 4, 1928, Serial No. 244,550, and in Germany January 8, 1927.

products. It is usually pre erable to conduct 15 the polymerization in the presence of buffer systems with a fixed hydrogen-ion concentration, because the polymerrzation is thereby accelerated, and premature coagulation of the emulsion is prevented. A sutiable hydrogen-ion concentration for this operation is between pH=4= and 8.5 such as is obtained, for example, by the addition of acetic acid and sodium acetate or of secondary and ter tiary sodium hsphate.- The polymeriza- 25 tion may be e ected not only by heat-treatment but also by the exposure to light of short 'waVe-Iength, and also by the action of special polymerizing agents such as acrylic eskylamines, arylamines and the like or by :the

e resulting products may be worked u \in the same way as latex, into rubber pro ucts in any known or suitable manner as for example 'by coagulation, rolling, vulcanizing .andthelika f The following examples will further illus- .offirlilymerization.

40 hate the nature of the said inventionwhich however is not limited thereto. The partsare v I Ewahiple 1 v 100 of isoprene are emulsified-in 400 5 partsofwatenwith the: addition of parts of ammonium oleate, 3 partslof tertiary sodiby weight.

um phosphate and2 parts of secondary so-.. dium phosphate, for example in a so called- 1 turbo mixer of apparatus with a similar ac- 6 tion, and are then warmed at from 6Qto 80 ters,. condensation products of acrolein, al-

tration of pH about 3 to 4. The resulting ar'-.

tificial rubber can be furthertreated by rolling, drying, vulcanizing and other like means.

Ewample 2 for 14. days. An artificial latex is obtained from which the artificial rubber can'be recovered by the further treatment described in Example 1.

Example 3 A mixture of .100 parts of isoprene and 7 5 \parts of butadiene is emulsified in 500 parts of water, with the addition of parts of Turkey-red oil and 15 parts of tertiary sodium phosphate. The emulsion is then treated in the same manner as in Example 2, and furnishes an; excellent and really vulcaniza'ble product of latex character.

. What we claim is 1. The process for the production of stable substances of latex character, which comprises emulsifying diolefines in aqueous media with emulsifying agents having a-soaplike character, and polymerizing the emulsified materials in the presence of buffer systems.

, 2. The process for the production of stable 95 substances of latex character, which 'comprises emulsifying diolefines in" aqueous media with emulsifying agen ts having a soaplike character, and polymerizing the emulsified materials in the presence of butter systems maintaining .a hydrogen-ion concentra tion of pH between 4 and 8.5.

3. The process for the production of stable substances of latex character, which comprises emulsifying diolefines in aqueous media with sulfonic acids and polymerizing the emulsified materials by heating.

4. The process for the production of stable substances of latex character, which comprises emulsifying a mixture of butadiene and isoprene in water with Turkey-red oil and j polymerizing the emulsified product by heat- 7 ing to between and C. under pressure in the presence of tertiary sodium phosphate acting as a buffer system.

5. As a new article of manufacture, a stable product of latex character comprising water, Turkey-red oil, tertiary sodium phosphate, and a polymerized mixture-of butadiene and isoprene emulsified therein.

6. As a new article of manufacture, a stable product of latex character comprising water, an emulsifying agent having a soap-like character, a bufier system and a polymerized d.i-,

olefine emulsified therein.

7 As a new article of manufacture, a product of latex character comprising water, a sulphonic acid and a polymerized diolefine emulsified in the water.

In testimony whereof we have hereunto set our hands;

MARTIN LUTHER. CLAUS HEUCK. 

